Not sure which 2012 GMC Sierra Power Programmers & Performance Tuners are right for you? We have over 5642 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"Great product....was tired of the constant back and forth in city driving...easy to use just plug in and drive.............no more shifting back and forth now ...fuel mpg is around 20 mpg(2012 GMC Sierra with 5.3L, 2Wd).....have determined afm is a gimmick...........get high mileage according to dic when coasting, slowing down or going down hill.....again great product, easy to use, highly recommend" —Steve D from Mount Olive, NC bought a Range Active Fuel Management Disable Device for a 2012 GMC Sierra.
"Great product, easy to setup and straightforward. It does have an OBD-II port, and is a little thick but software updates and simple and tech support is helpful. The difference between level 2 to level 4 is obvious and having a k&n 77 series as well as Magnaflow exhaust helps, I notice the low level RPMs are much smoother, especially when that extra passing power is needed." —Angie S from El Paso, TX bought an Edge CTS Evolution Programmer for a 2012 GMC Sierra, 5.3L V8.
"NOTICED MORE TOP END, SMOOTHER SHIFT AT HIGH SPEEDS,NOT MUCH FOR MPG THANKS SHANNA" —Jon L from Williston, ND bought a Bully Dog Triple Dog GT Tuner (49-State Legal) for a 2012 GMC Sierra.
"Best way to get rid of that ridiculous active fuel management feature. I would definitely buy it again. Feels like I am driving a different truck." —Brett H from Austin, AR bought a Range Active Fuel Management Disable Device for a 2012 GMC Sierra.
"Good product no one even knows its in the truck smokes words n dodge all day i" —David G from Alice, TX bought a Superchips Cortex Programmer for a 2012 GMC Sierra, 5.3L V8.
"purchased a Max Energy tuner for my 2012 3500HD with the thought of gaining a little more response at take off. The product works as advertised if you are pretty happy with the overall performance and small increase in fuel mileage, about .5mpg towing at 29000 lb. It only adds a little power and overall performance, not something that will cause problems down the road. It did what I was after. This is the 7 Hypertech tuner I have purchased and not one of the engines have failed. Good Product." —Michael W A from Livingston , TX bought a Hypertech Max Energy Programmer for a 2012 GMC Sierra, 6.6L Duramax.
"Not getting the mpg boost that I expect, about 1-1.5. But the shift firmness did alot for the drivability of the truck, and the shift timing really helped with pickup. It also seems like the diablo helped smooth out the transfer from 4-8 cylinders. This is definitely worth the money truck has faster take off, and easier to drive, and a touch more mpgs. What else can you want from a tuner for a gas truck." —Christian M from Gray Court, SC bought a DiabloSport inTune I-1000 Tuner for a 2012 GMC Sierra.
"I was kind of skeptical about buying a product I haven't heard much about, but it is great. Super easy to install, don't have to worry about voiding my warranty. Truck feels like a hole different truck. No embarrassing noises coming from the motor, no more delays. Awesome product. Would definitely recommend." —Dillan C from Pearl River, LA bought a Range Active Fuel Management Disable Device for a 2012 GMC Sierra.
"Everyone who has the disappointing AFM on their GM trucks and SUVs should get one of these...it is,awesome to have FULL V8 power all the time. Better yet is the 2.5 mpg better fuel economy!!!!" —Troy U from Lancaster, OH bought a Range Active Fuel Management Disable Device for a 2012 GMC Sierra.
"Great little tuner By Diablo. Touch screen is a little finicky but overall I'm very happy with the product. It came with a quick guide but a full manual is available online. I gave it 4 stars based on the fact that I could not find any instruction regarding each tunable option. The Diablo tune already on the unit is quite impressive for a canned tune all the while I gained 3 mpg on city driving. I would definitely getting a Diablew custom tune to make the most of this unit." —Roger T from Hamilton, OH bought a DiabloSport inTune I-1000 Tuner for a 2012 GMC Sierra, 5.3L V8.
"Installed in my 98 z71 with a 350. I have 35s and it let me recalculate my speedmeter. Gave it more throttle response. Well worth the money." —Dillan C from Pearl River, LA bought a Hypertech Max Energy Programmer for a 2012 GMC Sierra, 5.7L V8.